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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929a8d220907b6084cc32f381e1899ac3883526d2f0ef906e2cd83dd93a97939' 
  AND token = 'QEZID9mPnEyIQrRu+rjGlXnnt/eRzJFZa5aYaMZU9FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}